• Effects of fermentation conditions on ethanol production from corn by Saccharomyces cerevisiae MS42Effects of fermentation conditions on ethanol production from corn by Saccharomyces cerevisiae MS42

    Abstract: Fermentation is a complicated process which depends on a variety of conditions. In order to gain high fermentation efficiency with a low level of toxins and impurities to obtain good products, it is essential to determine suitable conditions for the process. Within the scope of this study, the effects of some key conditions was estimat...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 629 | Lượt tải: 0

  • Phân tích một số phương pháp nghiên cứu trong giảng dạy tiếng PhápPhân tích một số phương pháp nghiên cứu trong giảng dạy tiếng Pháp

    Tóm tắt. Lựa chọn một phương pháp nghiên cứu phù hợp với đề tài luôn là trăn trở của nhiều học viên sau đại học. Bài viết này muốn trình bày với độc giả, đặc biệt là muốn chia sẻ với các bạn đang học thạc sĩ và nghiên cứu sinh, ba phương pháp nghiên cứu có thể được áp dụng trong lĩnh vực giảng dạy tiếng Pháp: nghiên cứu thực nghiệm, nghiên cứu h...

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  • Influence of temperature on the microstructure and phase transition of a CaSiO3 bulk modelInfluence of temperature on the microstructure and phase transition of a CaSiO3 bulk model

    Abstract. This paper studies the influence of temperature 500 K, 1500 K, 2500 K, 3500 K and 4000 K on the microstructure and phase transition of a CaSiO3 bulk model using the Molecular Dynamics method with the Born-Mayer pair interaction potential and periodic boundary conditions. The obtained samples were analyzed through the radial distributio...

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  • Influences of growth temperature and solution concentration on hydrothermal preparation of ZnO nanorodInfluences of growth temperature and solution concentration on hydrothermal preparation of ZnO nanorod

    Abstract. ZnO nanorod structures were grown on glass substrates using a hydrothermal method. Influences of growth temperature and hydrothermal solution concentration on ZnO nanorod structures were investigated. The results indicate that diameter and length of the ZnO nanorod increase with an increasing of growth temperature and hydrothermal sol...

    pdf6 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 437 | Lượt tải: 0

  • Enhanced photocatalytic efficiency of TiO2 with doped Ni-immobilized on silica gelEnhanced photocatalytic efficiency of TiO2 with doped Ni-immobilized on silica gel

    Abstract. Ni-doped TiO2, immobile on silica gel (Ti1−xNixO2/SiO2), was synthesized using the sol-gel method. The XRD patterns show that the TiO2 particles on SiO2 have an anatase crystalline structure with a particle size of around 7 nm in diameter. The results of absorption spectra indicate that the band gap of the anatase TiO2 powder was 3.3 ...

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  • Adsorption of methylene blue from aqueous solutions using activated carbon derived from coffee husksAdsorption of methylene blue from aqueous solutions using activated carbon derived from coffee husks

    Abstract. The adsorption of methylene blue (MB) onto activated carbon (AC) derived from coffee husk using zinc chloride activation at 600 oC was studied. The effects of various parameters such as contact time, initial MB concentration and temperature were investigated. The adsorption kinetics of pseudo first-order and pseudo second-order were u...

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  • Preparation and optical properties of LaSr2AlO5 doped with Ce and EuPreparation and optical properties of LaSr2AlO5 doped with Ce and Eu

    Abstract. A new host phosphors of LaSr2AlO5 doped with Ce and Eu was synthesized using a solid-state reaction method and the synthesis conditions were investigated. The samples were characterized by X-ray diffraction, scanning electron microscopy, photoluminescent (PL) and photoluminescent excitation (PLE) spectra. LaSr2AlO5:Ce shows a yellow e...

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  • Thermodynamic properties of molecular cryocrystals of nitrogen type with fcc and HCP structures in harmonic approximationThermodynamic properties of molecular cryocrystals of nitrogen type with fcc and HCP structures in harmonic approximation

    Abstract. On the basis of results obtained in the previous paper, by combining the statistical moment method and the self-consistent field method, the thermodynamic quantities for molecular cryocrystals of nitrogen type such as solid α-N2, α-CO, CO2 and N2O with face-centered cubic (FCC) structure and solid β-N2 with hexagonal close packed (HCP...

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  • Effect of transition metal ion substitution on structure and optical properties of ZnWO4 materialEffect of transition metal ion substitution on structure and optical properties of ZnWO4 material

    Abstract. In this presentation, we investigate the effects of transition metal (Fe, Co, Ni) substitution on structure and optical properties of ZnWO4 nanopowder prepared using the hydrothermal method. The prepared powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman scattering and optical absorption s...

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  • Structure of polyaza-heterocycles obtained from reaction of two (3-methylfuroxan-4-yl)phenylhydrazines with formaldehydeStructure of polyaza-heterocycles obtained from reaction of two (3-methylfuroxan-4-yl)phenylhydrazines with formaldehyde

    Abstract. 2-Methoxy-5-(3-methylfuroxan-4-yl)phenylhydrazine (Hy1) and 4,5- methylendioxy-2-(3-methylfuroxan-4-yl)phenylhidrazine (Hy2) were introduced in the reaction with paraformaldehyde in the presence of acetic acid as catalyst to afford two new polyaza-heterocyclic compounds: 2,5-bis[2-methoxy-5-(3-methylfuroxan-4-yl) phenylamino]-1,2,4,5-...

    pdf8 trang | Chia sẻ: thanhle95 | Ngày: 17/07/2021 | Lượt xem: 376 | Lượt tải: 0